Richard Stallman <rms@gnu.org> wrote:

> We've been waiting for a few weeks for someone to document gpg-agent.
> Many bugs in the code have been fixed, but this problem, which doesn't
> require debugging, has not been addressed.

The feature it self, and the only customize able part of it, the
variable `pgg-gpg-use-agent' has been documented since introduction.

I have added a short paragraph (see attached patch) to point out, that
the use of gpg-agent is recommended and where to get further information.

What else is missing?

cheers
sascha